Arc flash burns that occur outside the arc flash boundary are not likely to be which type of burn?

Arc flash burns that occur outside the arc flash boundary are not likely to be which type of burn?

• A. First-degree
• B. Second-degree
• C. Third-degree
• D. Fourth-degree

Answer: (B)

Arc flash boundary is set at the distance where the incident energy is about 1.2 cal/cm^2, which is the amount capable of causing a second‑degree burn on bare skin. Outside that boundary, the energy is lower, so the likelihood of a second‑degree burn drops to essentially none. Higher‑degree burns (third or fourth) require even more energy and are even less likely beyond the boundary. Outside the boundary, the burns you’d expect are much milder, with second‑degree burns not being typical.

Arc flash boundary is set at the distance where the incident energy is about 1.2 cal/cm^2, which is the amount capable of causing a second‑degree burn on bare skin. Outside that boundary, the energy is lower, so the likelihood of a second‑degree burn drops to essentially none. Higher‑degree burns (third or fourth) require even more energy and are even less likely beyond the boundary. Outside the boundary, the burns you’d expect are much milder, with second‑degree burns not being typical.